Power Supply And Ground

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

Power is supplied at all times

Through 10A fuse [No. 19, located in the fuse block (J/B)]
To key switch and key lock solenoid terminal 3, and
Through 15A fuse [No. 22, located in the fuse block (J/B)]
To BCM terminal 57, and
Through 50A fusible link (letter f , located in the fuse and fusible link box)
To BCM terminal 70.

When the key is inserted in key switch and key lock solenoid, power is supplied

Through the key switch and key lock solenoid terminal 4
To BCM terminal 37.

With the ignition switch in the ON or START position, power is supplied

Through 10A fuse (No. 59, located in the fuse and relay box)
To BCM terminal 38.

Ground is supplied

To BCM terminal 67
Through grounds M57, M61 and M79.

When the front door LH is opened, ground is supplied

To BCM terminal 47
Through case ground of front door switch LH.

When the front door RH is opened, ground is supplied

To BCM terminal 12
Through case ground of front door switch RH.

When the rear door LH is opened, ground is supplied

To BCM terminal 48
Through case ground of rear door switch LH.

When the rear door RH is opened, ground is supplied

To BCM terminal 13
Through case ground of rear door switch RH.

When the liftgate is opened, ground is supplied

To BCM terminal 43
Through back door latch (door ajar switch) terminal 7
Through back door latch (door ajar switch) terminal 8
Through grounds B7 and B19.

When the glass hatch is opened, ground is supplied

To BCM terminal 42
Through case ground of glass hatch ajar switch.

When the front door LH or front door RH door is unlocked by the door lock and unlock switch, BCM receives serial data

To BCM terminal 22
Through main power window and door lock/unlock switch terminal 14 or power window and door lock/unlock switch RH terminal 16
Through main power window and door lock/unlock switch terminal 17 or power window and door lock/unlock switch RH terminal 11
Through grounds M57, M61 and M79.

When the front door LH is unlocked by the key, the BCM receives serial data

To BCM terminal 22
Through main power window and door lock/unlock switch terminal 14
Through main power window and door lock/unlock switch terminal 6
Through front door lock assembly LH (key cylinder switch) terminal 6
Through front door lock assembly LH (key cylinder switch) terminal 5
Through grounds M57, M61 and M79.

When a signal, or combination of signals is received by BCM, ground is supplied

Through BCM terminal 63
To door mirror LH and RH terminal 13
To front room/map lamp assembly terminal 1
Through front room/map lamp assembly terminal 2
To personal lamps terminal 1, and
Through BCM terminal 49
To cargo lamp terminal 1.

With power and ground supplied, the lamps illuminate.